Type-writing machine.



W. 0. FARNIIM.

TYPE WRITING MACHINE.

APPLICATION FILED MAR. 21, 1903.

906,699. Patented Dec. 15, 1908.

2 SHEETS-BEEET 1.

d 7244! ATTUHNEY UNITED STATES rAiENT OFFICE.

WILLIAM C. FARNUMfOF ARLINGTON, VERMONT, ASSIGNOR TO WYOKOFF, SEAMANS &

BENEDICT, OF ILION, NEW YORK,A CORPORATION OF NEW YORh.

TYPE-WRITING MACHINE.

To all whom 'it may concern:

Be 1t known that I, VVILLIAM C. FARNUM,

a citizen of the United States, and resident of Arlington, in the countyof Bennington and State of Vermont, have, invented certain new anduseful Improvements in Typegspecially when a machine is operated very.ast. l

The invention consists of various features of construction, combinationsand arrangements ofparts, all of which are hereinafter fully describedand particularly defined in the appended claims.

, In the accompanying drawings, in which like reference numeralsdesignate like parts in the various views, Figure 1 is a front to rearvertical section and elevation, showing certain parts of a typewritingmachine ema. perspective on an enlarged scale of a lever, of which a'plan and rear edge view are shown in Figs. 2 and 3 respectively, and ofa fragment of an actuating device; Fig. 5, a perspective of a pair offeed-dogs .and a fragment of the dog-shaft and a spring, included in thecarriage-feed mechanism; Fig. 6, a perspective of one of the feed dogsshowing faces not shown in Fig. 5; and Figs.

'7 and 8 are rear views of the feed dogs and fragments of thefeed-wheel, illustrating the action of the (lOgS on the wheel.

The invention is shown for convenience applied to a machine differingfrom the common N o. 6 Remington only withrespect to the carriage-feedmechanism, but is generally applicable also to visible-writing machines,as well as to other understrike or swin ing-carriage machines besidesthe Remington.

The machine to which the i11vention is shown applied comprises the frame1 with Specification of Letters Patent. Application filed March 21,1903. Serial No. 148,941.

Patented Dec. 15, 1908.

its top 2, the fulcrum-bar 3, the keys at, the key-levers 5 eachconnected by a link 6 with a type-bar 7 the swinging-carriage S with theplaten 9 carried thereby, the universalbar 10, the rock-shaft 11, thelinks 12 and transverse bar 13 and arm 14 connecting the universal-barwith the rock-shaft, and the spring 15 acting on the rock-shaft, whichwill all be recognized as parts of a N 0. 6 Remington machine, andconsequently a' detailed description of these parts and their operationsis unnecessary.

The carriage-feed mechanism. acts on the rear part 16 of the carriagethrough the rack 17 and pinion 18.- The rack is bolted to the rear part16 of the carriage, it being movable with the carriage and in engagementwith the pinion 18. The pinion is fast .on a shaft 19 having bearings atits ends in.

a bracket 20 on the top 2 of the frame. This bracket is fastened to theframe by screws 21 and 22 extending through parts of the bracket intothreaded holes in the top 2. A feed-wheel 23 is also fast on the shaft-19. In bearings in this bracket is mounted another shaft 24, hereinaftertermed a ,dogshaft, there being on'it two feed-dogs 25 and 26. The dog25 is fixed on the dog-shaft by means of a screw 27 extending throughthe dog to the shaft, while the dog-26 is loose on the dog-shaft, but issecured to the other dog by a lost-motion connection formed by therecess28 in the upper 'end of the dog 26, and the pin 29 fixed inthe-dog 25 and extending through this recess; Hence each dog is movableon its axis in one direction under certain conditions without impartingmovement to the other. A spring 30, attached at one end tothe dog 26 andat the other to the dog 25, tends to keep the dogs in the relativepositions in which they are shown in Fig. 5, the pin 29.then being incontact with that end of the recess 28 which is between the pin and thefeed-wheel.

lever and in this plate is a slot 35, open at its rear "and smaller end,as appears by Fig. 4. The stud 31 extends through the rearor'n'arrowpart of this slot, in which it fits loosely, so when the lever is rockedto and fro on its fulcrum 33, the edges of the slot 35 act on the stud31 and impart motion to the dog 26 towards and from the feed wheel 23. Arestoring spring 36, which pulls on the lever, is attached to a pin 37on the lever and. to a pinBS fixed in the bracket 20. The rockingmovement of the lever is limited by a stop composed of a base 39 andarms 40, the stop being fastened to the top 2 of the frame by a screw 41passing through the base 39 into a threaded hole in the top 2.

Vilhen the lev er is in the position shown in Fig. 2, which is itsnormal positlon, it makes contact with the front arm of the stop, anditis movable from that position into contactwith'the rear arm 40 of thestop. An arm 42, by which the lever is moved from its normal position,is fixed on the rock-shaft 11. This arm has at its upper end a lateralextension 43, bearingagainst the back of the lever 32..

The machine is provided with a common spring-drum i4 and flexible band45, to

move the carriage under the control ofthe feed-mechanism described.

The teed-dog 25 engages the teed-wheel 23, and the dog 26 is outside ofthe path of the teeth of that wheel, when the dogs are in thier normalpositions, or those shown in Fig. 3. Then that end of the recess 28 inthe dogs 26, which is between the pin 29 and the feed-wheel, is incontact with the pin 29,

and the lever 32 is in the. position shown in Fig. 2. "With thedepression of a characterkey or the space-bar, the rock-shaft 11 isturned and the lever 32 is actuated by the arm 42 on the rock-shaft 11,whereupon the dog 26 is-advanced by the action of the slotted plate 34on the stud 31 into the path of the teeth of the feed-wheel 23, and thedog 25 is forced out of engagement with the teed-wheel by the action ofthe dog 26 on the pin 29. released from the dog 25, turns a very littlein consequence of the action of the springdrum on the carriage, but isinstantly arrested by the dog 26. .With the returnmovement of thecharacter-key or space-bar, the lever 32 is restored to its normalposition by the spring 36, and the do 26 is thereupon disengaged fromthefeed-wheehwhile the dog 25 is advanced by the spring 30 to thefeed-wheel, with which it makes contact on the outer end of a tooth, andthe feed-- the next tooth is engaged by the dog 25,

which isadvanced further by the spring 30 when the former tooth ceasesto obstruct its movement. Hence with each return" movement ofa'character-key or the space-bar,

the carriage travels a single letter-space.

The action just described is particularly illustrated in Figs. 7 and "8,the former Show:

ing the feed-wheel engaged by the dog 26,

The feed-wheel, as soon as it is.

and the latter showing the dog 26 disengaged from the teed-wheel and thedog 25 in contact with the outer end of a tooth of the wheel, so that.the feed-Wheel is then tree to .move to allow the carriage to advance.The arrow on Fig. 7 indicates the direction in which the feed-wheelturns as the carriage travels from right .to left, and the arrow-on Fig.8 indicates the direction of the rotation of the feed-wheel when thecarriage is moved from left to right. It will be seen that each dog actson the feed wheelv atthe edge of a dihedral angle formed by planescontaining the axes of the feed wheel and feed dog respectively andintersecting each other at substantially right angles, the motion. ofthat end of the dog which engages the wheel being almost at right anglesto a plane which is tangent to the end o-tthe engaged tooth oftheiwheel. i

From the construction and arrangement of the feed-wheel and feed-dogs,and their cooperation, as shown and described, are derived advantageswhich materially 'improve the action-of feed-mechanism such'as that towhichthe invention relates, As the upper and lower ends respectively ofthe dogs 25 and 26 are movable almost directly towards and from the axisof the feed-wheel, and as the dogs act on the wheel, with an excellentmechanical advantage, close to the outer ends of its teeth, only slightmove ments of the dogs are required to enable them to properly controlthe action of the feed-wheel. Hence the parts of the feedmechanism areso adjusted that when the dogs 25 and 26 are in their most advancedpositions, they extend only just under the teeth of the feed-wheel, asshown in Figs. 3 and 7 respectively. At the end of a down-- wardmovementof a character-key or the space-bar, the relations of the dogs to thefeed-wheel then being those shown in Fig. 7, the feed-wheel is preventedfrom turning by the engagement of the dog 26 with the outer edge of atooth of the feed wheel. Instantly, therefore, after the key or spacebarbegins to ascend,.the lever 32 actuated by the restoring spring36,retracts the dog 26,.andthe feed-wheel is released almost at 115 thebeginning of the upward movement of the key or space-bar, whereupon thefeed-- wheel turns and the carriage advances. The result is that thecarriage reaches'its next position evenbefore the type-bar last actu-120 ated is retracted far enough from the platen to afford clearance foranother type-bar advancing toward the platen. 'No matter, therefore, howfast themachine may be" operated, aletter or character will not be 125printed over another on the paper.

The dog-shaft 24 is provided at A- stop-pin l8, fixed in the bracket 20and 13 0.

"yields as the dog 25 moves backward, the

dog 26 being held still by the lever 32.

Hence until the dog 25 is allowed to return to its normal position toreiingage the feed wheel, through the action on this dog of the spring30, the carriage is free from the control of the feed-mechanism andmovable either way with the hand. It is thus movable from left to right,when the dog 26 is in its normal position, although the dog'25 is incontact with the teed-wheel, for the action of the dog 25 on thefeed-wheel, like that of a pawl on a ratchet-wheel, is only capable ofcontrolling the feed-wheel when it tends to move in one direction. Meansto act on the crank-pin $7, to release the carriage as above explained,may be attached to the carriage if desired, suitable means being shownand described in another application filed by me March 21, 1903, andbearing the Serial No. H8942.

Various changes may be made in the mechanism above described withoutavoiding the spirit of the invention. What I claim as new and desire byLetters Patent, is

1. In carriage feed mechanism of typewriting machines, the combinationwith a feed wheel mounted on a horizontal axis, of a feed dog pivoted toa support on the rear of the frame of the machine and extending downwardfrom its axis and operative on the feed wheel below the horizontal planecontaining the axis of the feed wheel, a lever fulcrumed on the framebelow said feed dog and operative on this feed dog at its lower end,said lever constituting means to hold this feed dog normally disengagedfrom the feed wheel, and another feed dog connected withthefirst-mentioned feed dog and nor.- mally engagedwith the feed wheelabove the horizontal plane containing the axis of the feed wheel andmovable from its normal position when the other feed dog and said leverare at rest.

In carriage feed mechanism of typewriting machines, the combination witha to secu re feed wheel. of a feed dog pivoted to a support on the rearof the frame of the machine and extending downward from its axis andoperative at its lower end on the feed wheel, a lever ful IllIDB'Clbelow said feed dog on a fixed vertical pivot and operative on this feeddog at the lower end of said dog, and

another feed dog operatively connected with the-first mentioned feeddog.

3. In carriage 'feed mechanism of'typewriting machines, the combinationwith a feed wheel, of a feed dog pivoted to a support on the rear of theframe of the machine and extending downward from its axis and operativeat its lower end on the feed wheel, and having aprojection on its lowerend, a lever fulcrumed below this feed dog on a fixed vertical pivot andincluding a slotted device engaged with said projection. and anotherfeed dog operatively connected with the first mentioned feed dog.

4. 1n carriage feed mechanism of typewriting machines, the combinationwith a feed wheel, of a feed dog pivoted on ahorizontal axis andoperative on the feed wheel, a lever pivoted on a fixed verti -al axisand operative on said feed dog, a rocker mounted on a horizontal axis atright angles to a vertical .plane containing the axis of said teed dog,said rocker including an arm operative on said lever, 'andanother feeddog operatively connected with the first-mentioned feed dog.

1n carriage feed mechanism of typewriting machines, the. combinationwith a feed wheel, of a feed dog pivoted on a horizontal axisandextendingdownward therefrom and operative at its lower end on thefeed wheel, a lever pivoted on' a fixed vertical axis, and operative onsaid feed dog at the lower end thereof, a rocker mounted on a horizontalaxis at right angles to a vertical plane containing the axis of saidfeed dog,

said rocker including an arm operative onsaid lever, and another feeddog operatively.

successively act upon the teeth engaged by the normally engageddetent-pawl. a trip device mounted on one of the pawls and arranged toengage the other pawl, both of said pawls being mounted upon the samesupport and having coincident axes of oscillation, and means foractuating the pawlbearing he trip device.

7. 111 combination with a rotary escapewheel having detent-teeth, anormally engaged detent-pawl with its tooth removably held in the pathof movement of the detent- V teeth on the escape-wheel. a normallydisengaged pawl independently mounted with respectto the engaged pawl.but on the same support and having a tooth arranged to successively actupon the teeth of the escape- 'lieel engaged by the normally engagedpawl, a trip device mounted on one of the pawls and arranged to engagethe other and State of New York, this 20thv day of pawlin disengagingthe normally engaged March, A. D. 1903.

pawl both of said paw'ls having the same I 1 axis hf oscillation andmeans for actuating WILLIAM FARNUM' 5 the pawl bearing-the trip device.Witnesses:

Signed at the borough of Manhattan, city E. M. WELLS,

of New York, in the county of New York, K. V. DONOVAN.

